Wet desulfurization spray tower and desulfurization method

Abstract

The invention discloses a wet desulfurization spray tower and a desulfurization method. The desulfurization method comprises the following steps: (1) introducing flue gas to the wet desulfurization spray tower for desulfurizing, spraying clear water to a demister by a water replenishing spray layer arranged at the top part of the wet desulfurization spray tower, and cleaning the demister; (2) enabling liquid drops removed from the demister and water after cleaning the demister to flow into a slot type liquid mixer of a slot type liquid distributor under a flow diversion action of a demisted water collector and to be mixed with a higher-concentration alkaline solution from an alkaline solution spray pipe, and reacting; (3) enabling a primarily diluted alkaline solution in the slot type liquid mixer to overflow into an alkaline solution tank through tank bodies arranged at two sides of the top part of the slot type liquid mixer, uniformly distributing the alkaline solution on cross section of a tower body through the slot type liquid distributor, enabling the alkaline solution to fall on a filler layer under the slot type liquid distributor, forming an alkaline solution membrane on the filler layer, and desulfurizing the flue gas.

Description

technical field [0001] The invention specifically relates to a wet desulfurization spray tower and a desulfurization method. Background technique [0002] Wet desulfurization is a spray tower, which is a common gas-liquid reaction device. Sodium hydroxide lye is pumped to the spray layer at the top of the tower through circulating water and mixed with demisting water to form dispersed small droplets and fall, while the flue gas flows countercurrently. On the other hand, the gas and liquid are fully contacted, the flue gas is washed, and the sulfur dioxide in the flue gas is washed and removed. [0003] In the existing wet desulfurization method, a lye spray layer is generally installed in the desulfurization tower, and the sprayed lye flows in reverse with the flue gas, and the lye reacts with the sulfur dioxide in the flue gas to remove the sulfur dioxide. Since the flue gas will carry a large number of liquid droplets during the flow process, if the flue gas after wet des...

AI Technical Summary

Problems solved by technology

Since the flue gas will carry a large number of liquid droplets during the flow process, if the flue gas after wet desulfurization is directly discharged outside, it will have a certain impact on the surrounding environment

Therefore, a demister will be installed at the outlet of the wet desulfurization tower. Because the mist carried in the flue gas not only contains water, but also dissolves sulfuric acid, sulfate, sulfur dioxide, etc., which is highly corrosive and has a negative impact on the demister. Serious impact on service life

[0004] In addition, if a single-layer lye spray layer is installed in the wet desulfurization tower, the efficiency of flue gas desulfurization will be low, and the content of sulfur dioxide in the flue gas at the outlet of the desulfurization tower will not meet the standard, which will still cause certain harm to the environment

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